Hello World program in Ruby language

Writing a Hello World program in Ruby is as simple as writing a single line in a file as

puts 'Hello World'

Run the Ruby program

Create a file name as hello.rb in your favorite editor or through command line editor like vim.

Although, you can give any name to file. I have used hello. By convention, Ruby source files have .rb file extension.

Then, type following line in the file:

puts 'Hello World' # or puts "Hello World"

Run the program in the terminal or shell as:

ruby hello.rb

Show Output

Congrats! You just wrote your first program in Ruby.

Quiz - Hello World

Show Answer

In Ruby we use \# for single line comments

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The exention for Ruby programs is ".rb".

Key points to understand

• File extension of Ruby program is .rb
• To print strings into the standard output (i.e terminal), you can use puts, which means “put string”.
• # is used as comment operator